Fremgangsmåde til dannelse af et ekstrudat

摘要

A method of forming an extrusion comprises passing a first, plastics material ( 12 ) through a first channel ( 104 ) in a die, passing a second, plastics material ( 14 ) through a second channel ( 112 ) in the die, and passing a third, plastics material ( 16 ) through a third channel ( 314 ) in the die. At least one of the materials is passed through a metering gap into contact with the other materials to cause the at least one material to bond with the other materials as the materials pass through the die.